Dental instrument



(No Mddel.)

J. 0. BLAIR. DENTAL INSTRUMENT. No. 484,287. Patented Oct. 11, 1892.

I "m a m e W/TNESSES: INVENTO/f: 02040 JOHN C.BLA|R.

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UNITED STATES PATENT OFFICE.

JOHN C. BLAIR, OF LOUISVILLE, KENTUCKY.

DENTAL INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 484,287, dated October11, 1892.

Application filed March 2, 1892. Serial No. 423,535. (No model.)

To all whom it may concern.-

Be itknown that 1, JOHN G. BLAIR, residing at Louisville, in the countyof Jefferson and State of Kentucky, have invented a new and ImprovedInstrument for Use in Dental Surgery, of which the following is aspecification.

My dental instrument or appliance is designed for use in treating deador pulpless teeth preparatory to filling. In other words, it is aninstrument adapted for injecting a .certain vapor or gas into thepulp-cavity and root-canals of teeth that have died from exposure ordisease for the purpose of disinfecting the same and destroying anypoisonous matter that may be contained therein.

The instrument is shown in the accompanying drawings, Figure 1 beingmainly a longitudinal section, and Figs. 2 and 3 cross-sections on lines2 2 and 3 3, respectively, of Fig. 1.

The body of the instrument is composed of a small tube 0,, provided atone point with a wooden casing b, which forms a handle, and passingthrough a short cylindrical receiver or gas-generator 0, designed tohold the medicinal substance while being vaporized. A hollow needle 01is screwed on one end of the tube a, and a rubbertube e is connectedwith a compressible bulb attached to the other end of the same. Inpractice the proportional dimensions of parts may be as follows: Thetube a six inches in length,the cylinder 0 one inch long andfive-eighths of an inch in diameter, and the rubber tube 6 about teninches long. The tube a has two openings Within the cylinder c, and aplug f is inserted between them, so that the air forced in by the bulbis caused to pass out of one opening into the chamber and then re-enterthe bulb, as shown by arrows.

The medicinal substance I prefer to employ whereby air is forced intothe gas-chamber I and expels or carries along with it a portion of theiodoform gas or vapor into the tooth. The result is that the surface.with which the gas comes in contact is disinfected and all forms ofminute animal life are destroyed. The vapor will condense in the smallerrootcanals and till them, so that they will not require to be pluggedwith gold, &c., after treatment. The larger roots should, however, beplugged, as well as the main chamber or cavity of the tooth.

The instrument is very convenient and effective in use, but siinpleinconstruction, and may be furnished at small cost.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is

In an instrument of the class hereinbefore indicated, the combination,with the receiver 0, of the air-cond noting tube having two openingswithin said receiver, and a plug which is located between the openings,as and for 'the purpose specified.

JOHN C. BLAIR.

Witnesses:

ALBERT J. SCHOETTLIN, F. H. KAUNERTZ.

